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Micro Chapter 4

TermDefinition
Growth In terms of numbers
Binary Fission How prokaryotes divide
Physical Requirements for Growth -Temperature -pH -Osmotic Pressue
Psychrophiles Cooler conditions slow down growth, but eventually cause spoilage
Mesophiles Best at body temperature and most common
Thermophiles Grow best in hot temperatures
pH 7 is the best pH for growth
Acidophiles Grow under acidic conditions
Hypotonic Cell swells, H2O in
Isotonic Cell is stable, H2O in & H2O out
Hypertonic Cell shrivels, H2O out
Extremophiles Any bacteria that live under extreme conditions
Chemical Requirements for Growth -Carbon -Oxygen
Carbon All cells need Carbon
Chemoautotrophs Uses Carbon to produce food (plants)
Chemoheterotrophs Needs others for sources of Carbon (humans)
Microaerophiles -Require small amounts of O2 -Aerobic
Obligate Aerobes -Have to have constant O2 -Aerobic
Aerotolerant -Don't use O2, but can tolerate it -Aerobic
Facultative -Uses O2 when present, but ferments when it is not -Anaerobic
Obligate Anaerobes -Harmed by O2 (toxic to them) -Anaerobic
Quorum Sensing Bacteria communication through chemicals
Created by: aleahgoodson